Fate of [14C]mancozeb in egg plants (Solanum melongena L.) during summer under sub-tropical conditions

Kumar, U.; Agarwal, H.C.

Fate of [14C]mancozeb in egg plants (Solanum melongena L.) during summer under sub-tropical conditions

1992

Kumar, U. | Agarwal, H.C.

The fungicide mancozeb belongs to ethylenebis(dithiocarbamate) group of fungicides which is used to control brown and black rust, leaf spot, leaf blight, downy mildew etc. on a variety of plants including egg plants, tomato, potato and others. [14C]mancozeb, when applied to the foliage of egg plants (Solanum melongena L.) during summer months, dissipated very rapidly with a half-life of only 10.6 days. Ethylenethiourea (ETU), ethyleneurea (EU), ethylenethiuram disulfide (ETD), ethylenethiuram monosulfide (ETM) were the metabolites of [14C]mancozeb detected in all the plant parts at different times after the treatment. The amount of ETU in fruits after fourteen days of treatment was only 206 micrograms kg-1 which is below the maximum permissible level and ultimately came down to 4.6 micrograms kg-1 after 42 days. EU was found to be the predominant metabolite, suggesting the breakdown of unstable ETU to relatively stable EU under subtropical conditions.

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